What salty said. Or, take a piece of Aluminum foil and fold in half. Cut the pattern in the foil. Since you folded it over, the pattern is the same on both sides. You can also cut down the folded part so you can paint the back at the same time. When painting, center the fold on the center of the plug. You can use binder clips or a few clothes pins to keep the foil in place. Spray lightly through the mask. Instant lines or whatever pattern you want
Jigman